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Charge exchange in cometary coma: Discovery of H- ions in the solar wind close to comet 67P/Churyumov-Gerasimenko

By J. L. Burch, T. E. Cravens, K. Llera, R. Goldstein, P. Mokashi, Chia-Yu Tzou and T. Broiles

Abstract

As Rosetta was orbiting comet 67P/Churyumov-Gerasimenko, the Ion and Electron Sensor detected negative particles with angular distributions like those of the concurrently measured solar wind protons but with fluxes of only about 10% of the proton fluxes and energies of about 90% of the proton energies. Using well-known cross sections and energy-loss data, it is determined that the fluxes and energies of the negative particles are consistent with the production of H- ions in the solar wind by double charge exchange with molecules in the coma

Topics: 530 Physics
Publisher: American Geophysical Union
Year: 2015
DOI identifier: 10.1002/2015gl064504
OAI identifier: oai:boris.unibe.ch:81645

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